Hugo gabler-adlersfeld



Iatented Aug. 28, 1928 UNITED STATES HUGO GABLER-ADLERSFELD, OF VIEN1\TA, AUSTRIA.

PRODUCTION OF IMITATION PAINTINGS.

No Drawing. Application filed March 19, 1924, Serial No. 700,437, and in Germany March 29, 1923.

The object of this invention is improvements in the production of imitation paintings.

Various colouring processes are already known in which a sensitized photographic solution containing silver-compounds or a sensitized carbon tissue is applied on a carrier such as a plate of glass that has previously been coated with a layer of rubber, wax or the like, the plate being afterwards exposed under a photographic negative. The photographic positive film thus produced which is face downward on the glass plate is then painted from the back, whereafter canvas, paper or the like is fixed on the layer of paint and after drying, the picture with the canvas is detached from the glass plate.

As will be readily understood in the pictures produced by these known processes the outlines and shades are merely due to the pigment viz carbon since they difier from the lights only by the presence of more or less pigment. In consequence thereof such pictures produce the impression of colouredphotographs and not of pictures in oilor watercolours.

According to the present invention this drawback is removed in that the chromated gelatine used in producing the image is add ed with no colouring substance at all or is only slightly tinted by adding a transparent colour, such as an aniline dye soluble in water and does not contain any solid pigmenting particles. It is evident that there being not any solid pigment or carbon in the gelatine layer the paints applied to the back of the image are readily visible on its front side and that the effects of light and shade in the picture are due solely to the action of the paint.

In order to explain the present invention more fully I shall give in the following a detailed example of the manner in which this process can be performed.

I begin by cleaning the transparent support say a glass-plate by rubbing it with talcum and coat it with a transparent varnish or lacquer preferably with collodion by spreading a solution of the latter upon it and allowing it to dry. Upon this layer of collodion I pour a solution of chromated gelatine in water. By the term chromated I wish to express th at the solution of gelatine has been added with a chromate or bichromate in a manner well lmown in the art whereby the said gelatine acquires the property of getting insoluble in water after having been exposed to the act1on of light. The so prepared layer of chromated gelatine is then allowed to dry in a dark-room or the like. Instead of supplying the solution of gelatine with a chromate or bichromate I may spread a solution of gelatine 1n water upon the layer of collodion and after drylng sensitize the gelatine film with a chormate or bichromate say potassium bichromate in a manner well known in the art. In this case too the chromated gelatine is Well dried, actinic light being shut off from the plate as soon as sensitizing has taken place. I next take a photographic negative of the object I wish to reproduce and make a print from it through the transparent sheet or support. After printing the development is effected in warm Water in the manner known in the pigment process, the non-exposed gelatine being detached in the warm water,whereas the picture formed by the exposed gelatine adheres to the collodion film. The result of this process is a diapositive in chromated gelatine.

Instead of producing the gelatine picture on the collodian sheet in the described way the gelatine picture may be produced separately and be secured to the collodion layer by pressure. For this purpose I may coat a paper with gelatine and having allowed it to dry I sensitize it in a manner known in the art by applying of say a 10 per cent solution of potassium bichromate on the gelatine film by means of brushes or the like. After drying in a dark-room the chromated gelatine layer is exposed in a printing frame under a photographic negative of the object to be reproduced to the action of light. The picture is subsequently secured to the layer of collodion by pressure, is then developed by Warm water in the ordinary way and the paper is detached from the picture The result of this modified process is as in the instance heretofore described a diapositive in chromated gelatine face downwards on the collodion layer.

After drying this diapositive is painted with covering oilor water-colours. Finally a sheet of fabric is glued to the layer of paint. If desired the picture may then be pulled off from the glass sheet and may be secured on a suitable mount such as a frame.

In applying the paint the artist is guided by the diapositive in chromated gelatine. Since this latter is of an orange colour the artist can perceive the details of the picture in a quite sufficient degree. But I may still add to the chromated gelatine such an amount of transparent (or glazing) colours say an aniline dye as is desirable tor imparting the picture a general colouring for instance a light bluish, brownish or reddish tint. This slight colouring moreover renders the gelatine image more visible for the artist who has to apply the paint, but being weal: does not prevent the paint from being readily visible on the front side of the picture so that to the artist full liberty is given in choosing the tone of coloration best suited for the purpose. But I may eventually omit the addition of a colouring material since in most cases the natural tinge of the chromated gelatine will be sufficient.

I claim 1. A process of producing imitation paintings consisting in coating a transparent support with a layer of a transparent substance supplying this coating with a layer or chromated gelatine that does not contain any solid particles of pigment, exposing the latter to the action of light under a photographic negative, developing the image, drying, ap plying paint to the diapositive obtained by the said developing, securing after drying of the paint a sheet of a tough flexible material on the layer of paint and finally pulling off the picture from the transparent support.

2. A process of producing imitation paintings consisting in coating a transparent support with a layer of a transparent substance supplying this coating with a layer of chromated gelatine that does not contain any solid particles of pigment, the latter being added with some transparent colour, exposing this layer of gelatine to the action of light under a photographic negative, developing the image, drying, applying paint to the diapositive obtained by the said developing, securing after drying of the paint a sheet of a tough flexible material on the layer of paint and finally pulling off the picture from the transparent support.

3. A process of producing imitation paintings consisting in coating a transparent support with a layer of a transparent substance, supplying this coating with a photographic diapositive consisting of chromated gelatine that does not contain any solid particles of pigment, drying, applying paint to the said diapositive, securing after drying of the paint a sheet of a tough flexible material on the layer of paint and finally pulling off the picture from the transparent support.

4:. A process of producing imitation paintings consisting in coating a transparent support with a lay-er of a transparent substance, supplying this coating with a photographic diapositive consisting of chromated gelatine that does not contain any solid particles of pigment and is added with some transparent colour, drying, applying paint to the said diapositive, securing after drying of the paint a sheet of a tough flexible material on the layer of paint and finally pulling off the picture from the transparent support.

5. A picture consisting in combination of a transparent support coated with a transparent film, a diapositive formed by a chromated albuminous substance that does not contain any solid particles of pigment, superimposed upon the said transparent film and a layer of paint on the said diapositive.

6. A picture consisting in combination of a transparent support coated with a transparent film, a diapositive formed by a chr0- mated albuminous substance that does not contain any solid particles of pigment and is tinted with some transparent colour, added to it superimposed upon the said transparent film and a layer of paint on the said diapositive.

7. A picture consisting in combination of a transparent film, a diapositive formed by a chromated albuminous substance that does not contain any solid particles of pigment superimposed upon the said transparent film, a layer of paint on the diapositive and a sheet of fabric fixed to the layer of paint.

8. A picture consisting in combination of a transparent film, a diapositive formed by a chromated albuminous substance that is tinted by some transparent color added to it and does not contain any solid particles of pigment superimposed upon the said transparent film, a layer of paint on the diapositive and a sheet of fabric fixed to the layer of paint.

In testimony whereof I afiix my signature.

HUGO GABLER-ADLERSFELD. 

